Combine water, vinegar and salt. Bring to a full boil. Pour boiling mixture into jars filled with beans, leaving 1/4-inch head space.

Wipe top edge of jar and place warmed lid on the jar. Add the band and tighten. Process 10 minutes in a boiling water bath. Remove and set on racks to cool. Do not set directly on a counter top after removing from hot water bath.